M4 DCT GEARBOX SHUDDER

[320dtoy]

Howzat Fanatics,

My 2016 BMW M4 with a DCT gearbox shudders/jerky on reverse up a slope on cold start only. Is this normal? Mileage approximately 32000kms. I experience no jerking after the car is driven for a while or warmed up...

Thanks

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[ChrisPy]

Yup yup. It will jerk as if it’s a learner driver??

Happens in both forward and reverse and flat for me if I’m the elements for the day. Well mine does at least. I find that starting the car when it’s cold first and then putting on my seat belt etc. Before pulling away helps a bit. Just that little bit of an idle before pulling off helps.

Alternatively just get used to it. Light throttle applications tend to help but I suppose the slope is calling for more throttle input. Also try move a bit. Then stop for say 5sec and then move again.

I’ve read up on this issue and seems common.

 

[320dtoy]

Thanks Chris...much appreciated

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[MR_Y]

This behaviour seems normal for some dual clutch gearboxes as they age.
My TT Mk2 DSG started exhibiting low speed jerkiness with higher mileage (>60,000km).
Audi, back then, just performed software adaptations/calibrations and the jerkiness went away.
But, the issue came back after a week or two.
I was told it was due to me driving too often in stop/go traffic, so the DSG gets confused.

However, my PDK (even before it was replaced recently) exhibited zero jerkiness in all driving situations.

 

[TurboLlew]

It will do that. Temperature related to a degree and I think clutch wear related as well. I had my clutches done at 90000 and it was fine for another 45000km before noticing it a bit again. I did regularly complain and have the adaptations reset prior to this (I was hoping for a new box on plan LOL). However if I park on an incline and start up cold (like @ChrisPy says if it is out the garage or you're at a client for the day etc), there is sometimes a pretty aggressive jerk getting going (if it is a steep incline, you even feel it going into gear). I think as long as it doesn't do it when warm you shouldn't worry too much. My box is on 145000km now.

 

[MR_Y]

It will do that. Temperature related to a degree and I think clutch wear related as well. I had my clutches done at 90000 and it was fine for another 45000km before noticing it a bit again. I did regularly complain and have the adaptations reset prior to this (I was hoping for a new box on plan LOL). However if I park on an incline and start up cold (like @ChrisPy says if it is out the garage or you're at a client for the day etc), there is sometimes a pretty aggressive jerk getting going (if it is a steep incline, you even feel it going into gear). I think as long as it doesn't do it when warm you shouldn't worry too much. My box is on 145000km now.

Do you think that this is the reason why the new M3/4 have normal auto boxes?

 

[TurboLlew]

Do you think that this is the reason why the new M3/4 have normal auto boxes?

The average person buying these cars want a more luxury experience than racecar experience (though they won't admit it LOL) and I do know many many people complained about it, particularly in the US. It wouldn't surprise me at all if that was the reason. The DCT box needed to have come like the Subarus/Evos used to: with a list of the 'normal' noises and behaviours (particularly in more aggressive modes and diff settings) LOL. TBH that's partially why I love the DCT.

A lot of people also bought it expecting it to be like an auto in traffic. There is no DCT that really LIKES being in traffic though it is far better than F1/SMG boxes.

 

[922-ZN]

Mine doesnt do this at all, but I usually have to reverse out of the garage, then get out and push the bike back into the garage (small garage so need to shuffle) and then get back in reverse and drive off so perhaps its warmed up more than yours by the time I drive.
But I have had it on several occasions where travelling slow it bounces like a bucking horse in second even though the revs seem to be high enough at which time I just manually change up to 3rd which sorts it out.
Other times it doesnt seem to want to change gears in comfort........so will stay in a low gear all the way to say around 5000rpm before changing. Other times like when wanting to overtake, I put my foot down and it will rev high, then change down and then accelerate - very slow to react..

Try adjusting your Drivelogic, on setting 2 or 3 it usually hangs on to gears a bit longer as it is in a "sportier" mode, level 1 on drivelogic changes like butter for calm and casual driving. The bucking in second gear is your throttle mapping, throttle is way too aggressive for casual driving in sport, try dropping it to comfort or efficiency.

 

[ChrisPy]

Try adjusting your Drivelogic, on setting 2 or 3 it usually hangs on to gears a bit longer as it is in a "sportier" mode, level 1 on drivelogic changes like butter for calm and casual driving. The bucking in second gear is your throttle mapping, throttle is way too aggressive for casual driving in sport, try dropping it to comfort or efficiency.

Don’t all settings revert back to calmest settings on restart?

unless @Brucet is pressing a M1 or 2 button for every drive?

I find mine to be clunky in 1st and fine above that.

+1 on the Throttle in mode 3 for slow driving. It’s embarrassing, but hilarious at the same time.

 

[ChrisPy]

The average person buying these cars want a more luxury experience than racecar experience (though they won't admit it LOL) and I do know many many people complained about it, particularly in the US. It wouldn't surprise me at all if that was the reason. The DCT box needed to have come like the Subarus/Evos used to: with a list of the 'normal' noises and behaviours (particularly in more aggressive modes and diff settings) LOL. TBH that's partially why I love the DCT.

A lot of people also bought it expecting it to be like an auto in traffic. There is no DCT that really LIKES being in traffic though it is far better than F1/SMG boxes.

It’s why I love the DCT as well.

All of the raw or hardcore aspects of the M3 is what I love about it.

Its like people complain about brake squeal on a performance car running performance pads. Then switch to a comfort pad and complain it doesn’t stop as well or makes too much brake dust. Like you say. The authentic fans want the rough edges. The rest (majority) want the comfort, but claim their car is a slayer, smile when they brag about the stats and cry when the rough edges show.

 

[922-ZN]

It’s why I love the DCT as well.

All of the raw or hardcore aspects of the M3 is what I love about it.

Its like people complain about brake squeal on a performance car running performance pads. Then switch to a comfort pad and complain it doesn’t stop as well or makes too much brake dust. Like you say. The authentic fans want the rough edges. The rest (majority) want the comfort, but claim their car is a slayer, smile when they brag about the stats and cry when the rough edges show.

Brake squeal? Try sitting in a car with carbon ceramics, you can actually hear yourself grinding away money, but the stopping power is worth every cent, squeal, squawk or grind

 

[TurboLlew]

ChirsPy you are right they do reset after restarting but I have set M1 and M2 how I like them and usually press M1 after I have left the area I live in. I suspect that possibly my settings have changed back to how BMW set them as default. I need to check.



Im not complaining about the harshness. I like it. In fact I am willing to bet my car has amoungst the hardest rides of most street M4's. My complaint is more about the inconsistancy I have experienced and the sometimes "over reving" in one gear when you are expecting it to change in auto mode. I have had to "override" it but changing up using the paddle, more than once when cruising slowly in traffic. hearing it engage into gear and clunk every now and again, is what I assumed to be normal and hasnt bothered me at all.


My brakes squeek sometimes also but nothng compared to my race car. I thought it was normal for M4's 😆

My 4C and wife's Merc have an intermediate mode where you can request an up or downshift with the paddles but if you don't do anything your next gear is back into auto mode. The 4C has a separate button to go into full manual mode (it will bounce off the limiter or only downshift if the car is pretty much ready to stall). With the M5, you request a gear to avoid the scenario above (you know you want to change a gear) but then it switches to sequential and you have to continue shifting yourself or put it back into drive. Not sure if the new one works differently.

 

[Tc Reddy]

Hi guys, i have noticed on few of my vehicles that the gearbox adapts very quickly to how we were driving in a short period of time , this is when i also have the revs hanging on at low speeds instead of changing up.Its like if im driving harder than usual ,the next time im driving normal il have the revs hanging on too long,This happens on my 2.0L biturbo ranger aswel.
On another issue about shudder ,i noticed my M4 either wheel hops or shudder if i floor is from stand still on 1st gear,wonder if any of you guys experienced this,much appreciated friends

 

[Tc Reddy]

Howzat Fanatics,

My 2016 BMW M4 with a DCT gearbox shudders/jerky on reverse up a slope on cold start only. Is this normal? Mileage approximately 32000kms. I experience no jerking after the car is driven for a while or warmed up...

Thanks

Sent from my SM-G955F using Tapatalk

Hi, my car will also become jerky if I'm a tiny bit harder on the gas when its cold, in efficiency mode it hardly dose it and i just feather th throttle especially on inclines until its warmed up a bit.